Take-Back Reviewers

• 
• 91%
• have previously deleted reviews

649 of the 715 reviewers have had at least one of their past reviews for another product deleted. This is an excessively large percentage of Take-Back Reviewers which may indicate unnatural reviews.

Read more about our Suspicious Reviewers test.

• 
• 22%
• Used substantial repetitive phrases

155 of the 715 total reviews for this product use substantial repetitive phrases between them. These reviewers have rated this product an average of 4.6 while reviews without substantial repetitive phrases rated this product an average of 4.3. Based on our statistical modeling, the discrepancy in average rating between these two groups is significant enough to believe that the difference is not due to random chance, and may indicate that there are unnatural reviews.

Read more about our Phrase Repetition test.

• 
• 26%
• Created over 18 days

We counted 715 reviews for this product over the span of 468 days, an average of 1.5 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 7 or fewer reviews on any given day.

However, we see the following 18 days exceeding this threshold:

• 14 Reviews on Sep 13, 2019 (Avg. rating: 4.1)
• 13 Reviews on Sep 14, 2019 (Avg. rating: 4.6)
• 13 Reviews on Sep 18, 2019 (Avg. rating: 4.4)
• 13 Reviews on Sep 2, 2019 (Avg. rating: 4.2)
• 12 Reviews on Sep 5, 2019 (Avg. rating: 4.7)
• 12 Reviews on Jun 12, 2019 (Avg. rating: 4.6)
• 12 Reviews on Aug 30, 2019 (Avg. rating: 4.3)
• 10 Reviews on Sep 12, 2019 (Avg. rating: 4.7)
• 10 Reviews on Sep 11, 2019 (Avg. rating: 4.4)
• 10 Reviews on Sep 6, 2019 (Avg. rating: 4.1)
• 10 Reviews on Sep 20, 2019 (Avg. rating: 4.1)
• 9 Reviews on Sep 15, 2019 (Avg. rating: 4.7)
• 9 Reviews on Sep 3, 2019 (Avg. rating: 4.6)
• 9 Reviews on Sep 21, 2019 (Avg. rating: 4.4)
• 9 Reviews on Sep 10, 2019 (Avg. rating: 4.2)
• 8 Reviews on Sep 8, 2019 (Avg. rating: 4.6)
• 8 Reviews on Sep 17, 2019 (Avg. rating: 4.5)
• 8 Reviews on Sep 16, 2019 (Avg. rating: 4.4)
Show All

In total, we found that 189 reviews were created on just 18 days. This is an excessively high number of reviews submitted on these high volume days.

Read more about our Rating Trend test.

• 
• 50%
• Have an overrepresented word count

In the graph above, we can see the distribution of review word counts for this product and the expected distribution for this category. We see the following 2 groups with a statistically significant greater concentration than what we'd expect to see:

• 66-100 words: 21.4% (Avg. rating: 4.4)
• 101-200 words: 28.3% (Avg. rating: 4.3)

In total, we found that 355 reviews (or 50%) are within an overrepresented word count group. While this is more reviews from overrepresented word count groups than we'd expect to see, these reviews do not appear to have a significant impact on the overall rating.

Read more about our Word Count Comparison test.

• 
• 67%
• Substantial overlapping review history

480 of the 715 reviewers have substantial overlapping product review history. While this is more than we'd expect to see, the discrepancy in ratings between these reviewers and reviewers who have a more unique product review history isn't significant enough to rule out the possibility of it being due to random chance.

Read more about our Overlapping Review History test.

• 
• 0%
• Unverified Purchases

0 of the 715 total reviews for this product are unverified purchases. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
Unverified purchases may be the result of Kindle Unlimited readers, buyers who didn't pay full price, or reviewers who did not purchase the product at Amazon. Read more about our Unverified Purchases test.

• 
• 0%
• From reviewers with an overrepresented participation

We didn't find any participation groups that had a statistically significant greater concentration than what we'd expect to see in this category.
Read more about our Reviewer Participation test.

The ease score is the average rating for all reviews that a given reviewer submits. The average ease score for reviewers of this product is 4.4, while the average ease score for reviewers in this category is 4.3. While this discrepancy is rather large, it is not quite large enough to rule out the possibility of it being due random chance.

Brand Repeaters

We didn't detect a substantial amount of Brand Repeaters.

On Oct 3, 2016, Amazon prohibited incentivized reviews, however we still test for them since there are still millions in our dataset.

• 
• 1%
• Admitted to receiving an incentive

5 of the 715 total reviews for this product admitted to receiving a free or discounted product in exchange for a review. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.

Read more about our Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.

• 0
• Reviews have been deleted

We have not discovered any deleted reviews for this product.

There are a few limitations to keep in mind regarding the Deleted Reviews test:

1. We don't have a magic ability to collect every single deleted review; we can only identify reviews as deleted if we collect them on one date and then notice they are no longer visible on a subsequent date.
2. We have no information on reviews that were never published in the first place.
3. We also don't know why these reviews were removed. It could be action from the platform, personal decision by the review author, part of an entire account closure, even some data error on our part, etc.

Read more about our Deleted Reviews test.